But you would think with the breaking / separation of family system to due immigration, opportunities and general cultural shift it would be a lot harder for a family to marry off their daughter to someone else against her preferences? I mean surely if she wanted she could go away to SF to live with him? Hopefully violence wasn't involved but the whole parental wish thing worked because of family system, lack of opportunities and culture - so I am sure plenty of things have changed for the good even if it didn't work out in this one case.
This mentality is the exact point GP is trying to make. If your preference is for people of your own caste/race/etc. then those divisions will be reinforced. I don't think anyone here is saying that you shouldn't marry based on your own preferences. Just that people not considering caste as part of marriage decisions would be a good signal that caste is losing relevance.
Bonus clip: https://www.youtube.com/watch?v=DF6W1XD25Dc